<?php
    // +----------------------------------------------------------------------
    // | ThinkPHP [ WE CAN DO IT JUST THINK ]
    // +----------------------------------------------------------------------
    // | Copyright (c) 2006~2017 http://thinkphp.cn All rights reserved.
    // +----------------------------------------------------------------------
    // | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
    // +----------------------------------------------------------------------
    // | Author: liu21st <liu21st@gmail.com>
    // +----------------------------------------------------------------------
    namespace think;

    use think\response\Json as JsonResponse;
    use think\response\Jsonp as JsonpResponse;
    use think\response\Redirect as RedirectResponse;
    use think\response\View as ViewResponse;
    use think\response\Xml as XmlResponse;

    class Response {
        // 原始数据
        protected $data;
        // 当前的contentType
        protected $contentType = 'text/html';
        // 字符集
        protected $charset = 'utf-8';
        //状态
        protected $code = 200;
        // 输出参数
        protected $options = [];
        // header参数
        protected $header  = [];
        protected $content = null;

        /**
         * 构造函数
         * @access   public
         * @param mixed $data    输出数据
         * @param int   $code
         * @param array $header
         * @param array $options 输出参数
         */
        public function __construct($data = '', $code = 200, array $header = [], $options = []) {
            $this->data($data);
            if (!empty($options)) {
                $this->options = array_merge($this->options, $options);
            }
            $this->contentType($this->contentType, $this->charset);
            $this->header = array_merge($this->header, $header);
            $this->code   = $code;
        }

        /**
         * 输出数据设置
         * @access public
         * @param mixed $data 输出数据
         * @return $this
         */
        public function data($data) {
            $this->data = $data;
            return $this;
        }

        /**
         * 页面输出类型
         * @param string $contentType 输出类型
         * @param string $charset     输出编码
         * @return $this
         */
        public function contentType($contentType, $charset = 'utf-8') {
            $this->header['Content-Type'] = $contentType . '; charset=' . $charset;
            return $this;
        }

        /**
         * 创建Response对象
         * @access public
         * @param mixed  $data    输出数据
         * @param string $type    输出类型
         * @param int    $code
         * @param array  $header
         * @param array  $options 输出参数
         * @return Response|JsonResponse|ViewResponse|XmlResponse|RedirectResponse|JsonpResponse
         */
        public static function create($data = '', $type = '', $code = 200, array $header = [], $options = []) {
            $type  = empty($type) ? 'null' : strtolower($type);
            $class = false !== strpos($type, '\\') ? $type : '\\think\\response\\' . ucfirst($type);
            if (class_exists($class)) {
                $response = new $class($data, $code, $header, $options);
            } else {
                $response = new static($data, $code, $header, $options);
            }
            return $response;
        }

        /**
         * 发送数据到客户端
         * @access public
         * @return mixed
         * @throws \InvalidArgumentException
         */
        public function send() {
            // 处理输出数据
            $data = $this->getContent();
            // Trace调试注入
            if (Env::get('app_trace', Config::get('app_trace'))) {
                Debug::inject($this, $data);
            }
            if (200 == $this->code) {
                $cache = Request::instance()->getCache();
                if ($cache) {
                    $this->header['Cache-Control'] = 'max-age=' . $cache[1] . ',must-revalidate';
                    $this->header['Last-Modified'] = gmdate('D, d M Y H:i:s') . ' GMT';
                    $this->header['Expires']       = gmdate('D, d M Y H:i:s', $_SERVER['REQUEST_TIME'] + $cache[1]) . ' GMT';
                    Cache::set($cache[0], [
                        $data,
                        $this->header
                    ], $cache[1]
                    );
                }
            }
            if (!headers_sent() && !empty($this->header)) {
                // 发送状态码
                http_response_code($this->code);
                // 发送头部信息
                foreach ($this->header as $name => $val) {
                    if (is_null($val)) {
                        header($name);
                    } else {
                        header($name . ':' . $val);
                    }
                }
            }
            echo $data;
            if (function_exists('fastcgi_finish_request')) {
                // 提高页面响应
                fastcgi_finish_request();
            }
            // 监听response_end
            Hook::listen('response_end', $this);
            // 清空当次请求有效的数据
            if (!($this instanceof RedirectResponse)) {
                Session::flush();
            }
        }

        /**
         * 获取输出数据
         * @return mixed
         */
        public function getContent() {
            if (null == $this->content) {
                $content = $this->output($this->data);
                if (null !== $content && !is_string($content) && !is_numeric($content) && !is_callable([
                                                                                                           $content,
                                                                                                           '__toString',
                                                                                                       ]
                    )
                ) {
                    throw new \InvalidArgumentException(sprintf('variable type error： %s', gettype($content)));
                }
                $this->content = (string)$content;
            }
            return $this->content;
        }

        /**
         * 处理数据
         * @access protected
         * @param mixed $data 要处理的数据
         * @return mixed
         */
        protected function output($data) {
            return $data;
        }

        /**
         * 输出的参数
         * @access public
         * @param mixed $options 输出参数
         * @return $this
         */
        public function options($options = []) {
            $this->options = array_merge($this->options, $options);
            return $this;
        }

        /**
         * 设置响应头
         * @access public
         * @param string|array $name  参数名
         * @param string       $value 参数值
         * @return $this
         */
        public function header($name, $value = null) {
            if (is_array($name)) {
                $this->header = array_merge($this->header, $name);
            } else {
                $this->header[$name] = $value;
            }
            return $this;
        }

        /**
         * 设置页面输出内容
         * @param $content
         * @return $this
         */
        public function content($content) {
            if (null !== $content && !is_string($content) && !is_numeric($content) && !is_callable([
                                                                                                       $content,
                                                                                                       '__toString',
                                                                                                   ]
                )
            ) {
                throw new \InvalidArgumentException(sprintf('variable type error： %s', gettype($content)));
            }
            $this->content = (string)$content;
            return $this;
        }

        /**
         * 发送HTTP状态
         * @param integer $code 状态码
         * @return $this
         */
        public function code($code) {
            $this->code = $code;
            return $this;
        }

        /**
         * LastModified
         * @param string $time
         * @return $this
         */
        public function lastModified($time) {
            $this->header['Last-Modified'] = $time;
            return $this;
        }

        /**
         * Expires
         * @param string $time
         * @return $this
         */
        public function expires($time) {
            $this->header['Expires'] = $time;
            return $this;
        }

        /**
         * ETag
         * @param string $eTag
         * @return $this
         */
        public function eTag($eTag) {
            $this->header['ETag'] = $eTag;
            return $this;
        }

        /**
         * 页面缓存控制
         * @param string $cache 状态码
         * @return $this
         */
        public function cacheControl($cache) {
            $this->header['Cache-control'] = $cache;
            return $this;
        }

        /**
         * 获取头部信息
         * @param string $name 头部名称
         * @return mixed
         */
        public function getHeader($name = '') {
            if (!empty($name)) {
                return isset($this->header[$name]) ? $this->header[$name] : null;
            } else {
                return $this->header;
            }
        }

        /**
         * 获取原始数据
         * @return mixed
         */
        public function getData() {
            return $this->data;
        }

        /**
         * 获取状态码
         * @return integer
         */
        public function getCode() {
            return $this->code;
        }
    }
